def population_for_country_in_year(country, year):
    """Optional: Define a function to return the population
    of a country in a year using a row from the poverty table."""
    geo = countries.where("name", are.equal_to(country)).column(0).item(0)
    country_pop = population.where("geo", are.equal_to(geo))
    country_pop_in_year = country_pop.where("time", are.equal_to(year)).column(2).item(0)
    return country_pop_in_year

def poverty_for_country_in_year(country, year)
    geo = countries.where("name", are.equal_to(country)).column(0).item(0)
    country_poverty = poverty.where("geo", are.equal_to(geo))
    country_poverty_in_year = country_poverty.where("time", are.equal_to(year)).column(2).item(0)
    return country_poverty_in_year

def population_living_in_poverty
    """Poverty Percent * Population of Country in Year"""
    return population_for_country_in_year(country, year)*poverty_for_country_in_year(country,year)

def poverty_timeline(country):
    """Draw a timeline of people living in extreme poverty in a country."""
    geo = countries.where("name", are.equal_to(country)).column(0).item(0)
    country_poverty = poverty.where("geo", are.equal_to(geo))
    ...